Lesson 1
Fill in the blank.
Work is the use of _____ to move an object over a distance.
force
What two parts do you need to make a wheel-and-axle?
A wheel and an axle
Who is going to reach the top first? A biker biking up a steep path or a biker biking up a less steep path?
A biker biking up a steep path.
T or F
For work to be done, an object has to move in the opposite direction of the force applied to it.
F
How many kinds of levers are there?
3
What might change the direction of a force or the amount of force that is needed?
A machine
A pulley
PLUS 200
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T or F
A machine reduces the amount of work done.
F
On a pry bar, where is the fulcrum?
It is where the pry bar meets the board.
What do we use to raise a flap up a pole?
We use a pulley.
When something moves along the threads of a screw, what is it moving along?
an inclined plane
Fill in the blank.
Adding pulleys can lower the force needed to do work. But, you have to pull a greater ______.
distance
What would you have if you were to unwrap the threads?
An inclined plane
What two things do you need to make a lever?
A fulcrum and a lever (lever arm)
Where is the fulcrum at the fishing rod?
at the part that touches the hand
What two factors does an inclined plane trade off to change the way work is done?
distance and force
What are the TWO things that an inclined plane changes?
1) amount of FORCE
2) DIRECTION of the force
What are the TWO ways a wheel-and-axle can work in?
1) Turn the wheel to make the axle move
2) Turn the axle to make the wheel move
How might a machine change the way work is done?
By changing the direction of the force applied or the amount of force that is used.
What must a wheel and an axle do to be a simple machine?
They must turn together.
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Why aren't your arms doing any work on the box that is being carried across the room?
Because your arms are lifting up, but the box is moving sideways.
Exchange your score with the highest group's!
:)